How to put nrf52840 to deep sleep(SYSTEM OFF)

RE: How to put nrf52840 to deep sleep(SYSTEM OFF)

Amanda Hsieh — Wed, 29 Sep 2021 08:27:35 GMT

Please create a new support case for your own issue.

-Amanda

RE: How to put nrf52840 to deep sleep(SYSTEM OFF)

Ridhi — Tue, 28 Sep 2021 16:06:56 GMT

hello Amanda,

As suggested by you :

The Template Application is an application that you can use as a starting point for developing your own application, using the hardware delivered in the nRF5 Development Kit. The application will stop advertising after 3 minutes and then go to system-off mode. To wake it up, press Button 1, and it will start advertising again.

I have followed this. I am able to find the device goes to system oFF mode.

I need help in this code that as:

1. as i flash the code on dk, the device should be initally in System off without any button press , giving nearvly 0.5-0.7 micro amp current.

2. then The application will stop advertising after 3 minutes and then go to system-off mode.

3. To wake it up, press Button 1, and it will start advertising again.

i am able to fullfill point 2 and 3. pls help how can i do the point 1 in same code

RE: How to put nrf52840 to deep sleep(SYSTEM OFF)

Amanda Hsieh — Tue, 14 Sep 2021 05:47:55 GMT

Have a look at Online Power Profiler for BLE and create a new support case if you need help.

-Amanda

RE: How to put nrf52840 to deep sleep(SYSTEM OFF)

Ridhi — Tue, 14 Sep 2021 05:08:22 GMT

Hi,

I want to measure the current values in nrf52832/40. pls assist and tell me what is the values ideally for any of the ble example.

RE: How to put nrf52840 to deep sleep(SYSTEM OFF)

Amanda Hsieh — Thu, 04 Mar 2021 09:48:48 GMT

Hi Roshan,

The GPIO will keep the state that was set before the chip entered System OFF. You will not be able to control it during System OFF, but it will "glow" or not, depending on what it did when System OFF was entered.

-Amanda H.

RE: How to put nrf52840 to deep sleep(SYSTEM OFF)

Roshan Prajapati — Thu, 25 Feb 2021 10:56:58 GMT

Hi Amanda,

Have one query!! what if my RGB LED & Buzzer is connected to GPIO?? I want to know if it's connected to GPIO then RGB LED will stop glowing & Buzzer will stop beeping when deep sleep mode is enabled or it will glow the RGB LED & buzzer?

Thanks

Roshan.

RE: How to put nrf52840 to deep sleep(SYSTEM OFF)

Amanda Hsieh — Thu, 19 Sep 2019 07:20:54 GMT

Hi,

I suggest you study how to initial bsp and use bsp event to call the sleep_mode_enter() in Template Application example.

bsp_init() -> app_button_enable() -> app_button_enable() -> nrfx_gpiote_in_event_enable(): Function for enabling sensing of a GPIOTE input pin.

-Amanda H.

RE: How to put nrf52840 to deep sleep(SYSTEM OFF)

davidm — Sun, 15 Sep 2019 21:47:19 GMT

I tried to put my App in deep sleep but it doesn't work the way I want it to. This is what I did, I added a sleep_mode_enter() function to main.c and tried to call it in button_event_handler, after the button is pressed. The outcome was, the board seems to go sleep but when I press the button again, it doesn't wake up.

Basically all I want to do is the board to be in deep sleep at all times.It will only wake up only when the button is pushed. When a button is pushed, then it will connect to the nearby server-peripheral kit and turn the LED on that board/server.

The reason I don't want to start from Template Application is that I already have an Application with several features, so it would just be easier to add deep sleep capability to the existing application instead of starting from scratch again.

I have attached my project below, I would greatly appreciate your help.I am using SDK 15.3.


static void button_event_handler(uint8_t pin_no, uint8_t button_action)
{
    ret_code_t err_code;

    switch (pin_no)
    {
        case LEDBUTTON_BUTTON_PIN:
            NRF_LOG_INFO("Button 1 is pressed");
            err_code = ble_lbs_led_status_send(&m_ble_lbs_c, button_action);
            if (err_code != NRF_SUCCESS &&
                err_code != BLE_ERROR_INVALID_CONN_HANDLE &&
                err_code != NRF_ERROR_INVALID_STATE)
            {
                APP_ERROR_CHECK(err_code);
            }
            if (err_code == NRF_SUCCESS)
            {
                NRF_LOG_INFO("LBS write LED state %d", button_action);
                sleep_mode_enter();
            }
            break;
            }
..........


static void sleep_mode_enter(void)
{
    ret_code_t err_code;

    err_code = bsp_indication_set(BSP_INDICATE_IDLE);
    APP_ERROR_CHECK(err_code);

    // Prepare wakeup buttons.
    err_code = bsp_btn_ble_sleep_mode_prepare();
    APP_ERROR_CHECK(err_code);

    // Go to system-off mode (this function will not return; wakeup will cause a reset).
    err_code = sd_power_system_off();
    APP_ERROR_CHECK(err_code);
}

devzone.nordicsemi.com/.../ble_5F00_app_5F00_blinky_5F00_c.zip

RE: How to put nrf52840 to deep sleep(SYSTEM OFF)

Amanda Hsieh — Fri, 06 Sep 2019 10:57:18 GMT

Yes, I would suggest starting with this Template Application example which might be closed to your requirement.

-Amanda H.

RE: How to put nrf52840 to deep sleep(SYSTEM OFF)

davidm — Fri, 06 Sep 2019 05:35:10 GMT

Thank you Amanda for clarification. So since all I want is to simply put the kit to sleep, button_init(), followed by sleep_mode_enter() and sd_power_system_off () directly in Main.c should do it?

RE: How to put nrf52840 to deep sleep(SYSTEM OFF)

Amanda Hsieh — Thu, 05 Sep 2019 07:41:58 GMT

Hi,

shut_down_handler function uses shutdown events to prepare the wakeup button and registered by NRF_PWR_MGMT_HANDLER_REGISTER. If you need to handle different shutdown events, ble_app_uart_c is a good example. Template Application /sleep_mode_enter() prepares the wakeup button without event handler and then sd_power_system_off () put the system to sleep directly.

nrf_pwr_mgmt_shutdown (used in ble_app_uart_c and Power Profiling Application ) schedules a callback to put the system to sleep.

-Amanda H.

RE: How to put nrf52840 to deep sleep(SYSTEM OFF)

davidm — Thu, 05 Sep 2019 03:44:29 GMT

Thank you Amanda.

So it seems like all I need to do is include button_init to enable pin sense mechanism, add shutdown_handler function and register it....and call nrf_pwr_mgmt_shutdown to put it to sleep, is that correct?

Regarding prepare buttons for wake up, in SDK 15.3 ble_app_uart_c, shut_down_handler is being used , but in other examples(Power Profiling Application and Template Application ) is not there, what are they using instead?

RE: How to put nrf52840 to deep sleep(SYSTEM OFF)

Amanda Hsieh — Wed, 04 Sep 2019 11:17:04 GMT

Hi,

[quote user="davidm"]First I need to enable GPIO sense mechanism. And this can be done in bsp_init, but the question is where do I pass the value to enable? [/quote]

buttons_init() -> bsp_init(BSP_INIT_LEDS | BSP_INIT_BUTTONS, NULL); -> app_button_init -> GPIOTE_CONFIG_IN_SENSE_TOGGLE(false);

The sense mechanism will be set for that pin.

[quote user="davidm"]how is NRF_PWR_MGMT_HANDLER_REGISTER used?[/quote]

Please this page NRF_PWR_MGMT_HANDLER_REGISTER

[quote user="davidm"]which files I need to include in order to use nrf_pwr_mgmt_shutdown?[/quote]

nRF5_SDK_15.3.0_59ac345\components\libraries\pwr_mgmt\nrf_pwr_mgmt.c

I suggest starting with this Template Application example.

-Amanda H.

RE: How to put nrf52840 to deep sleep(SYSTEM OFF)

davidm — Wed, 04 Sep 2019 04:03:58 GMT

Thank you Amanda,thank you again for the explanation. According to the details you provided above,my understanding is, In order to add deep sleep capability, I need to do to 3 things (and please correct my understanding if is wrong).

First I need to enable GPIO sense mechanism. And this can be done in bsp_init, but the question is where do I pass the value to enable?
The second thing is I need to configure wake up buttons, and I should be able to do this by registering shutdown_handler as it's done in 15.3 ble_app_uart_c. Question is how is NRF_PWR_MGMT_HANDLER_REGISTER used?
Third thing is to call nrf_pwr_mgmt_shutdown anywhere inside main(void). But the question is, which files I need to include in order to use nrf_pwr_mgmt_shutdown?

RE: How to put nrf52840 to deep sleep(SYSTEM OFF)

Amanda Hsieh — Tue, 03 Sep 2019 11:44:09 GMT

Hi,

[quote user="davidm"]You mentioned that in Power Profiling Application example shows how to configure wakeup buttons, but I didn't see, where they are doing that , also I tried to look for nrf_gpio_cfg_sense_input method in the example I didn't find it in the example.[/quote]

It's the DETECT signal that wakes the chip up from the system off sleep. So the gpio needs to enable sense mechanism. This is done in as part of buttons_init() -> bsp_init(BSP_INIT_LEDS | BSP_INIT_BUTTONS, NULL);

[quote user="davidm"]In the post I referenced above Simonr used bsp_btn_ble_sleep_mode_prepare() to prepare wake up buttons, what is the difference between bsp_btn_ble_sleep_mode_prepare() and nrf_gpio_cfg_sense_input ,which one should I use?[/quote]

In the SDK12.3 ble_app_uart_c, we use sleep_mode_enter(); -> bsp_btn_ble_sleep_mode_prepare(); -> bsp_wakeup_button_enable() -> wakeup_button_cfg(button_idx, true); -> nrf_gpio_cfg_sense_set() to prepare wake up buttons. Please also see nRF5 SDK v15.3.0: GPIO HAL. In SDK 15.3 ble_app_uart_c, it's done in shutdown_handler.

[quote user="davidm"]I know I can use sd_power_system_off () but my question still remains where can I put that, Can I place it anywhere I want in the Main.c 's int main(void){} without causing any issues?[/quote]

It supposes not causing any issues. In the examples, it calls nrf_pwr_mgmt_shutdown() -> shutdown_process(); -> sd_power_system_off();

-Amanda H.

RE: How to put nrf52840 to deep sleep(SYSTEM OFF)

davidm — Mon, 02 Sep 2019 21:40:20 GMT

Thank you, Amanda, for the response.

You mentioned that in Power Profiling Application example shows how to configure wakeup buttons, but I didn't see, where they are doing that , also I tried to look for nrf_gpio_cfg_sense_input method in the example I didn't find it in the example.
In the post I referenced above Simonr used bsp_btn_ble_sleep_mode_prepare() to prepare wake up buttons, what is the difference between bsp_btn_ble_sleep_mode_prepare() and nrf_gpio_cfg_sense_input ,which one should I use?
I know I can use sd_power_system_off () but my question still remains where can I put that, Can I place it anywhere I want in the Main.c 's int main(void){} without causing any issues?

RE: How to put nrf52840 to deep sleep(SYSTEM OFF)

Amanda Hsieh — Mon, 02 Sep 2019 13:02:17 GMT

Hi,

The nRF52840 can be put into System OFF mode by calling sd_power_system_off (), which puts the system to the deepest power-saving mode.

The system can be woken up through a DETECT signal generated by GPIO pins. Configurations of individual pins are done through the SENSE field in the PIN_CNF[n] register and can be set by calling nrf_gpio_cfg_sense_input(...). However, system OFF will disable all peripherals except for GPIO, LPCOMP, and NFC, and after waking up the system gets reset.

Another possibility is to put the system into System ON sleep mode, where the system will wake up on any event, and can be invoked by calling sd_app_evt_wait (). All the peripherals can be used and you can use GPIOTE interrupts to wake it up.

You can refer to the Power Profiling Application example. This sample application starts up, configures wakeup buttons, and enters the System OFF mode. On button presses, the application wakes up and goes into either 'Connectable mode' or 'Non-connectable mode' based on which button is pressed.

For more information on both modes, see sd_app_evt_wait and the nRF5 Series User Specification (Section: POWER - Power control).

-Amanda H.